Table 1.

Timeline of B-Pb (μg/dl), in lead exposed children during 60 months of follow-up by school.

		Time of Follow-up (months).
School number.		0	6	12	60
1	n	79	65	59	29
	Median	7.52	6.95	6.10	3.68
	Minimum	1.99	1.86	1.7	2.3
	Maximum	34.62	27.0	25.60	10.4
2	n	71	57	51	34
	Median	13.94	13.20	12.20	4.75
	Minimum	5.38	5.35	4.70	2.02
	Maximum	43.80	41.45	35.80	30.30
3	n	97	83	73	15
	Median	9.99	8.70	9.30	4.53
	Minimum	3.90	3.85	3.95	1.78
	Maximum	41.93	40.6	34.35	7.2
4	n	51	45	43	18
	Median	12.55	10.40	9.55	5.48
	Minimum	5.83	4.05	4.15	3.48
	Maximum	34.72	26.10	25.90	12.58
5	n	58	51	50	32
	Median	8.68	6.40	7.30	5.49
	Minimum	3.0	2.90	3.10	3.36
	Maximum	20.05	16.60	18.45	8.7
6	n	70	58	55	14
	Median	14.20	11.10	12.55	3.27
	Minimum	3.30	3.80	3.30	1.30
	Maximum	41.50	36.75	35.80	9.13
7	n	52	51	47	27
	Median	10.70	8.55	8.20	4.08
	Minimum	4.40	2.90	4.25	2.35
	Maximum	22.20	18.15	17.65	7.44
8	n	72	66	66	40
	Median	9.10	8.68	8.18	3.30
	Minimum	3.70	3.45	4.05	1.43
	Maximum	17.30	16.0	13.95	7.67
9	n	48	41	37	23
	Median	7.25	5.85	5.80	4.58
	Minimum	2.30	2.50	2.40	2.07
	Maximum	16.90	14.90	16.45	12.70
Total	n	598	517	481	232
	Median	10.12	8.75	8.30	4.40
	Minimum	1.9	1.85	1.7	1.30
	Maximum	43.8	41.45	35.8	30.3

Median, minimum and maximum are expressed as B-Pb concentrations expressed in μg/dl units.